Portable drill press



Much s, 1956 J. w. PIERSALL 2,737,065 PORTABLE DRILL PRESS v Filed Jan. 19, 1953 2 Sheets-Sheet 1 James W. Piersal/ INVENTOR.

BY I /ft...

March 6, 1956 J. w. PIERSALL 2,737,065

PORTABLE DRILL PRESS Filed Jan. 19, 1953 2 Sheets-Sheet 2 James W. Hbrsal/ IN VEN TOR.

BY L

United States Patent i PORTABLE DRILL PRESS James W. Piersall, Amarillo, Tex.

Application January 19 1953, Serial No. 331,869 2 Claims. (Cl. 77-7 This invention relates to tool attachments and more particularly to an attachment wherein a conventional power driven hand drill may be utilized in the manner of a portable or stationary drill press.

An object of this invention resides in the provision of a hand drill attachment that is simple in design and light in construction so as to provide, in assembled relation to a drill, a readily portable and easily manipulated drill press.

Another object is to provide a hand drill attachment that enables an operator to perform drilling operations with a minimum of fatigue.

Another object is to provide an attachment in conformity with the foregoing objects in which an operator may exert the proper force to the drill through a system of levers or links which provides him with a mechanical advantage.

Still another object is to provide a portable drill press wherein the tool is properly aligned during drilling operations.

A further object is to provide a device which may quickly be attached to any conventional hand drill.

A still further object is to provide a portable drill press wherein the laborious manual effort involved in drilling operations with conventional hand drills is obviated and wherein the drill is firmly maintained in position to accurately drill at any desired angle.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fuliy hereinafter described and claimed, reference being had to the accompanying'drawingsforming a part hereof, whereinlike numerals refer to like .parts throughout, and "in which:

Figure l is a perspective view of an operator utilizing the attachment in conjunction with a conventional hand drill;

Figure 2 is a perspective view showing an operator utilizing the attachment as a stationary drill press;

Figure 3 is another perspective view showing an operator utilizing the attachment for overhead drilling operations;

Figure 4 is a vertical section of the attachment with a conventional hand drill secured thereto and showing details of construction;

Figure 5 is a plan view of a hand drill and the attachment; and

Figure 6 is a horizontal section taken along line 6-6 of Figure 4 and showing the manner of attaching the forward end of a drill in the device.

Referring now more particularly to Figures 4-6, numeral 10 indicates a base or platform to which an upright or rod 12 is attached in any desired manner, such as welding or the like. A stop block 14 is also rigidly secured to the base it) and imparts additional rigidity to the upright 12. Block 14 also serves as a stop or rest against which Work may be rested during drilling operations. The guide lug 16 extends laterally of the 2,737,065 Patented Mar. 179-56 upright and carries at .its free end a guide rod 18 .ex- .tending parallel to the upright and secured, as by nuts 20, to the lug. Upper end portion 22 of .rod 18 .is threaded to receive a stop nut '24. It will be understood that should it be desired to rigidly maintain a drill .in the attachment at all times centered with respect to base it), lug 16 may be rigidly secured to non-rotatable upright 12, or should it be desired to-allow pivotal motion of the drill with respect to the base plate, the lug may be secured to the upright 12 by means of a setscrew or the like.

A coil compression spring 26 is concentrically received on upright 12 and seats at its lower end .on lug 16, its upper end abutting against a tubular member'28. Tubular member 28 snugly receives upright 12 and is slidable longitudinally thereof. Preferably, upright 12 is circular in cross-section throughout .its length and tubular member 28 is preferably circular in cross-section. A collar 30 rests upon the upper end of member 28 and a pivot member 32, which may conveniently take the form of a nut threadedly engaged upon-the upper end of the collar, is secured on the collar remote from the abutment between members 23 and 30. In order to utilize conventional and easily obtainable component parts, collar 30 and pivot member 32 are shown respectively as a length of .pipe or tube and a nut threadedly engaged thereon, although .these members may be formed integrally and need not be of the specific configuration shown.

Handle lever 34 is formed preferably at one end as a tubular boss 36 receiving a handle 38 and the remainder of .the lever may be bifurcated to provide spaced legs 4.0 which straddle nut 32 and are pivotally'secured thereto by pivot bolts 42. Free ends of legs 40 are pivotally secured, as by bolt 42, to one end of an upstanding link 44 presenting, at its upper end, a pair of spaced ears 46 which pivotally receive therebetween a reaction lever or latching dog 48. The latching dog is freely slidably and pivotally received on upright 12 and it will be seen that coil spring 50 serves to maintain the dog in spaced relation to collar 30.

In operation, downward movement of handle '38 will cause dog 48 to bind upon upright 12 and the handle will "befree to pivot through link 44 'to force collar 30 and tubular member 28 downwardly in opposition to compression spring 26.

A first support'member 52 is rigidly securedat the lower end of tubular member 28 and extends laterally-therefrom terminating in a yoke-54. An intermediate portion of the support ispro-vided with a vertical bore 56 through which guide rod '18 is received. A second support 58 is slidably received adjacent the upper end of tubular member 28 and is adjustablysecured'at any desired point along the member by setscrew 59. The outer end of the second support is provided with an inwardly extending vertical slot 60 which is adapted to adjustably receive a lock bolt assembly, as will be presently apparent.

Yoke 54 of the first support 52 is provided with four locating and securing screws 62 which are disposed in radial relationship and are adapted to be threaded within the yoke arms to engage the shank 64 of conventional hand drill 66. In this respect, it will be clear that these screws not only properly center the drill within the yoke arms but also rigidly attach the drill to the yoke.

With the drill thus positioned, setscrew 59 maybe loosened and support 58 slid downwardly on tubular member 23 into engagement with the upper portion of the drill and setscrew 59 may then be tightened to rigidly secure support member 58 to tubular member 28. Then, lock bolt 68 and cooperating lock nuts 70 and 72 may be manipulated so that bolt 68 will securely engage the upper end of the drill to complete the securement thereof in the supports.

With more particular reference to Figures 1-3, a few of the numerous positions in which the device may be utilized are shown. In Figure 1, an operator is manipulating the device so as to drill a substantially horizontal hole in one end of a box 74 and it will be seen that the base 10 is placed behind the portion to be drilled and that handle 38 is manipulated so as to bring the tool or drill 76 into engagement with the box end portion and perform a drilling operation thereon.

In Figure 2, base it) rests on a suitable support 78 and a V-block 80 is being used to hold a length of pipe 82 through which a diametrical hole is being drilled. This figure exemplifies the use of the device as a stationary drill press and it will be readily apparent that base 10 may be secured, as by bolts or the like, to any suitable support if so desired.

Figure 3 shows an operator performing an overhead drilling operation on a conduit or pipe 84. Due to the fact that the drill is positioned in a perpendicular relation to base 10, the hole drilled through the conduit 84 will likewise be perpendicular to the conduit and by initially positioning the drill in proper relation to the conduit, holes may be drilled through its diameter. This figure also more clearly points out the usefulness of having the handle assembly 38, etc., rotatably mounted about upright 12. As will be clear, handle $6 of drill 66 and handle 38 are disposed in angular relation with each other so that the position of the operators hands on the respective handles presents a comfortable and convenient positioning thereof. Of course, handle 38 may be swung a full 360 with respect to drill handle 86 to any position wherein it presents the most comfortable and convenient position for the operator of the assembly.

In performing drilling operations with a conventional hand drill alone, sufficient pressure must be exerted on the drill in order to properly penetrate the material worked upon and since this pressure is usually of fairly large order, particularly with metals, an operator is quickly fatigued and, on the whole, the process is quite laborious. Furthermore, the operator must steady the drill to such an extent that a straight and accurate hole will result and, as will be readily appreciated, it is extremely diflicult for the operator to so set his drill and still maintain the proper pressure for penetrating the material to be drilled.

With the instant device, these diificulties are overcome in that the handle assembly 38 and its associated linkage 40, 44 and 48 enable the operator to utilize a mechanical advantage in exerting a penetrating force on the drill 66 disposed Within the supports 52 and 53. Furthermore, since the hand of the operator which engages drill handle 86 is not called upon to exert any penetrating force to the drill, the full effectiveness of this hand may be utilized in steadying the device so as to accu rately machine a straight hole.

Obviously, the device need not be limited to drilling operations, it being equally adaptable for reaming, tapping or like operations.

Guide rod 18, by virtue of its engagement through bore 56 of support 52, prevents rotation of the drill 66 about upright 12 and lock nut 24 may be threaded to any position on the upper end 22 of the rod so as to maintain the drill 76 or other tool in any desired initial position relative to base 10. venient when a number of work pieces of the same or substantially the same thickness are to be drilled.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

Having described the invention, What is claimed as new l. A drill attachment comprising a base, an upright secured to the base, a member slidably received on said upright and adapted to carry a power driven hand drill, a separate collar slidably received on said upright above the member, a handle pivotally connected to said collar, and linkage operatively connecting the upright and the handle whereby the collar is urged against the upper end of the member for moving the member and drill toward the base, said linkage comprises a lever having one end slidably received on said upright in spaced relation to said collar, a link having opposite ends connected respectively to said handle and said lever.

2. A drill attachment comprising a base, an upright in the form of a round rod secured to the base, a tubular member slidably mounted on said upright and adapted to detachably support a power driven hand drill, a collar slidably and rotatably mounted on the upright above the tubular member, a handle pivotally connected to the collar, a lever having an aperture slidably and rotatably engaging the upright and a link member pivotally connecting the end of the lever and the handle, whereby the handle may be adjusted to any desired radial position relative to the upright and drill.

References Cited in the file of this patent UNITED STATES PATENTS Re. 15,864 Grau June 24, 1924 466,806 Spaulding Jan. 12, 1892 1,272,108 Robb et al. July 9, 1918 2,629,267 Hart Feb. 24, 1953 FOREIGN PATENTS 561,653 France Aug. 13, 1923 This is frequently con- 

